Mobile phone signal jammers have become standard equipment in examination rooms. Not only for high school and college entrance examinations, but also for postgraduate examinations, civil service examinations and various qualification certificate examinations, cell phone jammers [https://topsignaljammer.com/collections/cell-phone-jammers] are needed to prevent candidates from contacting the outside world through wireless signals. In the examination room where Dazhan Electronics’ mobile phone signal jammer is used, various mobile phone signals (2345G), wireless intercom signals, Bluetooth WiFi signals, etc. will be blocked by interference.
So let’s talk about mobile phone signal jammers. Why can they interfere with your mobile phone signal?
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We can temporarily compare a mobile phone to a radio. The radio often buzzes or the channel is simply messed up and cannot be heard. This means that the signal is interfered. Since the radio can be interfered, the same can be said for the mobile phone, which can be naturally and interference through some devices.
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It uses frequency multiplication, frequency division, frequency hopping filtering and other technologies to analyze the required shielding frequency for the uplink and downlink channels of the mobile phone system; it customizes a spherical shielding space according to the power of the shielder, and automatically forms a shielding magnetic field within the specified range. Make mobile phones (including PHS – PHS, GSM – China Unicom, China Mobile, CDMA – China Telecom) invalid in this space. When the jammer is in working condition, it can disable the signal sending and receiving functions of mobile phones within the specified range, making it impossible to make outgoing and incoming calls, thereby achieving the purpose of mandatory disabling.
The principle of radio communication: Within a certain frequency range, mobile phones and base stations are connected through radio electromagnetic waves, and data and sound transmission are completed with a certain baud rate and modulation method.
The communication principle of the mobile phone signal jammer is that the jammer scans from the low-end frequency to the high-end frequency of the forward channel at a certain speed during the working process. This scanning speed can cause garbled interference in the message signals received by the mobile phone. The mobile phone cannot detect normal data sent from the base station, making it impossible for the mobile phone to establish a connection with the base station. Mobile phones show symptoms such as searching the network, no signal, and no service system.
Since we know that the communication method of wireless communication is to use electromagnetic waves to communicate.
The functional properties of electromagnetic waves are determined by their frequency.
Different communication systems use different frequencies so that everyone can live in peace and not interfere with each other. The basic principle of cell phone jamming devices is to emit the same radio frequency signals as cell phones. Because the frequencies are the same, mobile phones cannot tell which signal is a regular base station signal, thus achieving “interference”. As long as there is a machine on the same frequency as the phone, it will make a lot of “noise” when the base station tries to connect to the phone. You will find that the signal from the phone is unrecognizable, so you will refuse to communicate with the phone.
In the early days, jammers only blocked one set of frequencies, such as 2G, while complex jammers could block several types of networks at the same time, such as 2-3-4-5G. So how is this multi-network interference achieved?
It’s actually simple. That is to say, the interference bands corresponding to these three signals are repeated in a cyclic manner, covering these three interference bands at the same time. The intervals of this cycle are so small that the mobile phone has no chance to speak and can only sit down and do it quietly. A brick.
It covers 2/3/4/5G, but what about Bluetooth and wifi? It doesn’t matter, it can be easily handled as well.
The jammer has evolved again, adding Bluetooth and WiFi frequency bands to the scanning range, so that several common communication methods in society are completely covered.
Many people do not understand the differences between Bluetooth, Wi-Fi and mobile data. They seem to be wireless communication technologies. In fact, the main difference between them is the frequency band. In mobile communication technology, 2G mainly works in the 900-1700MHz frequency band, 3G works in the 1900-2100MHz frequency band, 4G works in the 2300-2500MHz frequency band, and 5G works in the 3400-3600MHz frequency band. Bluetooth and WiFi work at 2.4GHz.
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